Depth-gage



(No Model.)

W. D. SPENCER.

DEPTH GAGE.

Patented Mar. 13

UNITED STATES PATENT OFFICE.

WILLIAM D. SPENCER, OF MIDDLETOWN, CONNECTICUT.

DEPTH-GAGE.

SPECIFICATION forming part of Letters Patent No. 379,423, dated March13, 1888.

Application filed December 27, 1887. Serial No. 259,086. (No model.)

To all who'm it may concern:

Be it known that I, \VILLIAM D. SPENCER, a citizen of the United States,residing at Middletown, in the county of Middlesex and State ofConnecticut, have invented new and useful Improvements in Depth-Gages,of which the following is a specification.

My invention relates to depth-gages, and the purpose thereof is toprovidea simple and accurate gage wherebyinterior measurements may bereadily and accurately determined,

lt is the purpose of my invention to provide a novel and improvedconstruction of the base plate, whereby the spindle may be carriedthrough the same and its graduations fully and distinctly exposed toview and caused to register with the straight edge of the baseplate. Itis also my purpose to combine with the spindle a simple locking deviceor clamp, whereby said spindle may be adjusted longitudinally andfastened at any point without displacing the adjusted spindle.

The invention consists in the several novel features of construction andnew combinations of parts, hereinafter fully set forth, and (led nitelypointed out in the claims.

In the accompanying drawings, Figure 1 is an elevation of an instrumentin which my invention is embodied. Fig. 2 is a central section of Fig.l, the section plane lying in the axis of the spindle. Fig. 3 is adetail view of the baseplate, and Fig. 4: isa view ofthe spindledetached.

In the said drawings, the reference-numeral 1 designates the base-plateof the gage, having a straight-edge, 2. In the center of the plate isformed a slot or channel, 3, at right angles to the straightedge and ofany suitable width. The base-plate 1 is inserted between two inclosing-plates, 4, having a tubular stem or handle, 5. A part of thecylindrical surface of this handle may be milled, if desired, as shownat 6.

The spindle of the gage consists of a cylindrical rod of steel, 7, masize to slide easily in the stem 5, and having at its end a flat bar, 8,preferably a little thinner than the base-plate 1, and of a width to fitthe central slot or channel 3 and to slide therein. .The flat portion ofthe stem is graduated in any suitable way..

Upon the cylindrical part 7 of the stem is fitted a tubular screw, 9,having a milled head, 10, and tapped into the end of the stem. The endof the screw is beveled off at 12 to give a conical form or taperthereto, and the threaded end of the stem which receives the screw isprovided with a shoulder, 13, with which the beveled end of thescrewengages. This screw is split by a central cut, 14, and when turned intoengagement with the shoulder 13 it is clamped upon the stem 7 with greatforce. A very small movement of the screw is sufficient to effect thisresult.

The manner of using this instrument is familiar to all artisans. Thestraight-edge 2 being placed on the surface of the article, the screw 9is turned to release the stem, which is pushed downward till its pointrests on the bottom of the recess or opening. The screw is then clampedon the stem, and the gage may be used for fixing a similar depth inanother recess or opening.

YVhat I claim is 1. In a depth-gage, the combinatiottwith a baseplatehavingaslotor channel therein, ofa tubular stem or handle, and agage-stem composed of a cylindrical portion moving in the handle and aflat graduated portion lying in the channel in the baseplate, and asplit tubular screw tapped into the end of the handle and having abeveled point engaging with a shoulder in the handle, substantially asdescribed.

2. In a depth-gage, a base-plate having a central slot or channel andprovided with a tubular handle, in combination with a stem having a flatgraduated portion movingin the slot of the base-plate and around'portion moving in the tubular handle and clamped by a splittubular screw, substantially as described.

3. In a depth-gage, the combination, with the base-plate having acentral channel and inclosed between plates having a tubular handle, ofa stem having a round portion moving in said handle and a flat graduatedportion moving in theslot of the baseplate, and a split tubular screwtapped into the end of the handle and having a beveled end engaging ashoulder in the handle, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WVILLIAM D; SPENCER.

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